FYI, this is no longer the case, but there is an important change that requires attention. If you install nupic.core/nupic.bindings from source, nupic will not attempt to re-install nupic.bindings. nupic will do the right thing. However, it leaves the responsibility of keeping nupic.bindings in sync up to the user.
Should you decide to install nupic.bindings from source after installing nupic without nupic.bindings pre-installed, you will need to uninstall the release version of nupic.bindings.
If you never install nupic.bindings from source, nupic will always do the right thing and install the release version of nupic.bindings specified in its requirements.txt file.